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Electronic solutions to modifying glow engines of all sizes to gasoline

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Electronic solutions to modifying glow engines of all sizes to gasoline

Old 10-27-2022, 05:30 AM
  #1076  
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Originally Posted by cmulder
Found this while sorting trough things.
It once came with a batch of used items and always assumed it was related to the retracts system and never opened it.
Turns out its a fuel pressure regulator / return valve.

Would a system like this be usefull to regulate the pressure before the solenoid?

Construction appears to be a (silicone?) tube that moves to open the return path on a set pressure has exeeded.a pressure value.
Thats interesting..... I don't think I quite get what the internals would look like - Have to think on it for a while...

Originally Posted by Raleighcopter
I finally loaded a spool of black ASA into my printer and had a go at it. Prints well but not as easy to print as PLA....
Looks like a good result Dave - Looks to be well bonded layer to layer which is important..
Old 10-27-2022, 05:32 AM
  #1077  
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Printed at 250c and very slowly. It's pretty solid.
Old 10-27-2022, 06:53 AM
  #1078  
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Originally Posted by cmulder
Found this while sorting trough things.
It once came with a batch of used items and always assumed it was related to the retracts system and never opened it.
Turns out its a fuel pressure regulator / return valve.

Would a system like this be usefull to regulate the pressure before the solenoid?

Construction appears to be a (silicone?) tube that moves to open the return path on a set pressure has exeeded.a pressure value.






Robart Auto mix instructions

Robart Auto mix side

Robart Auto mix top
I am pretty sure the auto-mix device is just an empty Y-connection without any internal regulating going on.
The Robart autopumper was a terrible thing that created bubbles in the fuel.
Old 10-27-2022, 06:54 AM
  #1079  
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Originally Posted by Raleighcopter
I finally loaded a spool of black ASA into my printer and had a go at it. Prints well but not as easy to print as PLA....


Looking good!
Old 10-27-2022, 08:39 AM
  #1080  
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Default it isn't empty

Originally Posted by 1967brutus
I am pretty sure the auto-mix device is just an empty Y-connection without any internal regulating going on.
The Robart autopumper was a terrible thing that created bubbles in the fuel.
You can look straight trough the 2 bottum connections but the red tube thing is blocking the top one.
Looks like some over pressure valve.

Where do they sell those one-way check valves like ys uses in there tank pressure system?
One of those using crank pressure with this thing might work well.
Old 10-27-2022, 08:43 AM
  #1081  
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Default think its just a tube that v=blocks

Originally Posted by Cat 1
Thats interesting..... I don't think I quite get what the internals would look like - Have to think on it for a while...
.
think the fuel pressure pushes the tube out of the way once a pressure is exeeded.
The inner bronse tube goes down half way between the input and return.
Old 10-28-2022, 04:49 AM
  #1082  
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Originally Posted by cmulder
think the fuel pressure pushes the tube out of the way once a pressure is exeeded.
The inner bronse tube goes down half way between the input and return.
Thanks for the explanations... I can see how it would work if the fuel pressure could push the silicone plug out of the way and open the vent .. Must be a little trick to get this to work at low (just above atmospheric) pressure outlet as suggested.

Also odd is the fact that they want the vents blocked (and opened when filling). I wonder where they get the venting from? Probably from the bubbles you noted and the crankcase. The comment about damage by back flow(back pressure) during filling indicates a "fragile" part inside.
Old 10-31-2022, 05:53 PM
  #1083  
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How's everyone doing? Did you survive Halloween ?

Spent a bunch of time doing a big shop clean up - I was starting to pile stuff on stuff..

Once done I spent a little time on the "new" SZ 37.. plan is to try the stock carb and just use the "E-pressure" control to try and clean up the curve a bit - Had to get an ignition pickup made and got that done this weekend. Followed Dave's lead and tried ASA for the sensor mount - It seems to do the trick and got a good result.

Chris



Old 11-01-2022, 12:07 AM
  #1084  
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Oh... was it Halloween? Didn't notice.

Too busy building:

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All that is left, is to secure the hinges, install fuel tank, fuel control and telemetry, and balance the thing.

That could be done in a day, but first I need to really clear my living room from all the snippets of covering...
Old 11-01-2022, 05:08 AM
  #1085  
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Looking Awesome Bert... Can't wait to see this one go. Looks like an excellent test bed for the Wankel ..

Old 11-01-2022, 05:36 AM
  #1086  
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Originally Posted by 1967brutus
That could be done in a day, but first I need to really clear my living room from all the snippets of covering...
Why? Sounds like priorities are reversed.

Cool looking plane. The jet style retracts are a nice touch.

Last edited by Glowgeek; 11-01-2022 at 05:40 AM.
Old 11-01-2022, 05:53 AM
  #1087  
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Originally Posted by Cat 1
Looking Awesome Bert... Can't wait to see this one go. Looks like an excellent test bed for the Wankel ..
I actually adapted the design of a Graupner X1200 and changed the shape of the tail end of the fuselage to maximize cooling.
In this pic, the wooden edge is an original Graupner part, and it can be seen that the radius of the engine bulkhead basically was identical to the radius of the engine itself, meaning that the entire engine except for the protrudding fins was shielded from the airflow. Of course, that radius was about 3/4" in front of the engine so there would have been "some" turblence, but probably not all that much,
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I changed that shape to this:
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where the engine bulkhead is following the shape of the motormount, and the turtledeck is beveled down to zero.
The Coanda effect should angle the airflow towards the engine core, and a much better cooling should theoretically be the result.

Also, in the original engine the wing extended under the engine (a bit like a swimming platform at the stern of a motoryacht) and I changed that to this:

That should bring SOME air to the underside of the engine. Fortunately, that part does not need cooling as much, as that is the induction side, but every little bit of cooling helps when running gasoline...
It looks like this one is going to weigh in at slightly over 2100 grammes where my original X1200 came in at about 2800 grammes...
Old 11-01-2022, 05:58 AM
  #1088  
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Originally Posted by Glowgeek
Why? Sounds like priorities are reversed.
it's not a matter of priorities, but a matter of necessity

Originally Posted by Glowgeek
Cool looking plane. The jet style retracts are a nice touch.
Thanks! The retracts actually ARE from a jet, the FreeWing Avanti S 80 mm DF. Relatively cheap, electrics and proven to be strong enough for an all up weight of 3 kilo.
Worst case the springs are a touch on the stiff side.
​​​​​​​
Old 11-01-2022, 07:29 AM
  #1089  
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Old 11-01-2022, 09:53 AM
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Originally Posted by 1967brutus
it's not a matter of priorities, but a matter of necessity



Thanks! The retracts actually ARE from a jet, the FreeWing Avanti S 80 mm DF. Relatively cheap, electrics and proven to be strong enough for an all up weight of 3 kilo.
Worst case the springs are a touch on the stiff side.
I thought those retracts looked familiar. There's an Avanti stuck 10 meters up in a tree at our field. We know the pilot, so no one wants to help him get it down.
Old 11-01-2022, 09:59 AM
  #1091  
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The piston ring in my Saito 220 is not round, not even close. Fairly certain that's why the compression never got solid and peak power is down. Ordered a RJM/Bowman ring for it, more later.
Old 11-01-2022, 10:06 AM
  #1092  
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Originally Posted by Glowgeek
I thought those retracts looked familiar. There's an Avanti stuck 10 meters up in a tree at our field. We know the pilot, so no one wants to help him get it down.
Dang dude! Free retracts!
Old 11-01-2022, 01:01 PM
  #1093  
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Originally Posted by Glowgeek
The piston ring in my Saito 220 is not round, not even close. Fairly certain that's why the compression never got solid and peak power is down. Ordered a RJM/Bowman ring for it, more later.
Hopefully the liner is still round?
Old 11-01-2022, 01:14 PM
  #1094  
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Originally Posted by 1967brutus
Hopefully the liner is still round?
No liner on a Saito 220, chromed aluminum cylinder. Yes it's round, as measured with a bore gauge and mic. The piston mics round as well.

I'm assuming the Saito steel ring deformed in the heat treating/pre-tensioning procedure. RJM/Bowman rings are cast iron and all of them I've used seal very well as soon as the engine is reassembled. One or two tanks of fuel is all that's needed to fully seat their rings.

I must have run a full gallon of fuel with that Saito ring, it never got better than mush. I bought a pair for the 200Ti as well, same problem.

Last edited by Glowgeek; 11-01-2022 at 01:16 PM.
Old 11-01-2022, 04:46 PM
  #1095  
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Lonnie,
Are you certain your 220 was fitted with a steel ring?
Old 11-01-2022, 08:22 PM
  #1096  
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Originally Posted by Glowgeek
No liner on a Saito 220, chromed aluminum cylinder. Yes it's round, as measured with a bore gauge and mic. The piston mics round as well.

I'm assuming the Saito steel ring deformed in the heat treating/pre-tensioning procedure. RJM/Bowman rings are cast iron and all of them I've used seal very well as soon as the engine is reassembled. One or two tanks of fuel is all that's needed to fully seat their rings.

I must have run a full gallon of fuel with that Saito ring, it never got better than mush. I bought a pair for the 200Ti as well, same problem.
Yeah, sorry about that, I know there is no liner, I should have said "bore". Anyway, that's moot if whatever it was I meant is still round, and that's a good thing.

You guys are lucky with RJM rings so easily availlable to you.

Last edited by 1967brutus; 11-01-2022 at 10:12 PM.
Old 11-02-2022, 05:43 AM
  #1097  
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One of the cylinders of My boxer won't come up to have decent compression also - I'm out of troubleshooting ideas so im assuming a ring but I didn't look at it that closely yet. I can tell by a simple leak down setup that its not coming out past the valves or anywhere else other than past the ring. It runs very well but Turning over by hand is very lopsided. Think a ring order to RMJ is going to happen - I have successfully build rings - but its a lot of work and I have had good success with RMJ's...
Old 11-02-2022, 09:27 AM
  #1098  
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My 1.20 twin had a stuck ring that caused lopsided compression. Have you checked that the ring isn't stuck?
Originally Posted by Cat 1
One of the cylinders of My boxer won't come up to have decent compression also - I'm out of troubleshooting ideas so im assuming a ring but I didn't look at it that closely yet. I can tell by a simple leak down setup that its not coming out past the valves or anywhere else other than past the ring. It runs very well but Turning over by hand is very lopsided. Think a ring order to RMJ is going to happen - I have successfully build rings - but its a lot of work and I have had good success with RMJ's...
Old 11-02-2022, 11:39 AM
  #1099  
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Originally Posted by 1967brutus
Oh... was it Halloween? Didn't notice.

Too busy building:

Attachment 2272431

Attachment 2272432

Attachment 2272433

Attachment 2272434

Attachment 2272435

All that is left, is to secure the hinges, install fuel tank, fuel control and telemetry, and balance the thing.

That could be done in a day, but first I need to really clear my living room from all the snippets of covering...
Looks great Bert, nice work.
Old 11-02-2022, 01:38 PM
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Thanks Bob! I had fun building. One day tops and she'll be flightready, but tomorrow ain't going to be that day. Hope to finish the job Friday.

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